Model verification of analogue infiltration predictions

A survey of current methods of calculating natural ventilation and infiltration rates showed that most design recommendations are based on the results of digital analogue studies. As the natural ventilation rate calculation methods reviewed make a number of simplifying assumptions, which have not been experimentally verified, studies have been carried out, using scale model buildings in a wind tunnel, to investigate the validity of these methods. Calculated ventilation rates were found to be up to 30% higher than the model ventilation rates.